I have fainted on a plane three times during long journeys. It usually happens after waking up from a deep sleep. I wake up, start feeling sick to my stomach, get up to try and go to the restroom and then I pass out. My doctor says that I should elevate my legs abouve heart level. That is impossible on an airplane. has anybody out there experienced it and done anything about it. I do not have a heart condition, or thrombosis. My blood pressure is normally a little below the norm. The limited oxygen in the plane further lowers my pressure, but what can I do to prevent the fainting spells? After I come to I have a vomiting spell that lasts for hours. When I finally get to sleep on a bed, I sleep for hours and then wake up feeling perfectly ok.